<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>赋值语句</title>
</head>
<body>
    <!-- 赋值运算
            1. =
            2. += 追加
        一元运算
            1. ++
            2. --
    -->
    <script>
        let uname = 'lemon'
        let uage = 18
        // uage = uage + 1
        // uage += 1 
        uage--
        console.log(uage)

    </script>
</body>
</html>